DL Envelope Size
The DL envelope measures 110 × 220 mm (4.33 × 8.66 in). It is the standard long envelope for letters folded in three.
| Millimetres | 110 × 220 mm |
|---|---|
| Centimetres | 11 × 22 cm |
| Inches | 4.33 × 8.66 in |
| Aspect ratio (long ÷ short) | 2.000 |
| Series | ISO 269 (DL stands for "DIN Lang") |
| Fits | An A4 sheet folded in three (210 × 99 mm), or an A5 sheet folded once |
Where you will see DL
DL is the usual envelope for business letters, invoices and statements. An A4 page folded into three equal panels measures 210 × 99 mm, which slips into a 110 × 220 mm DL envelope with a little room to spare.
How to fold A4 for a DL envelope
Fold the bottom third of the page up, then fold the top third down over it, so the page has three panels of 99 mm each. Put the folded edge into the envelope first.
Frequently asked questions
What does DL stand for?
DL stands for "DIN Lang", which is German for "long".
Does an A4 page fit in a DL envelope?
Yes, when folded in three equal parts. A tri-folded A4 page is 210 × 99 mm, which fits a 110 × 220 mm DL envelope.
Related
Last updated: 2026-10-03